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POSTRETIREMENT BENEFITS - Change in Benefit Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Change in benefit obligations: |  |  |
Beginning balance, benefit obligations | $ 103,189 | $ 95,330 |
Interest cost | 4,556 | 5,264 | $ 5,175
Actuarial gain (loss) | (3,432) | 8,979 |
Benefits and administrative expenses paid | (6,559) | (6,384) |
Ending balance, benefit obligations | 97,754 | 103,189 | 95,330
Change in plan assets: |  |  |
Beginning balance, fair value of plan assets | 111,934 | 105,443 |
Actual return on plan assets | 677 | 12,599 |
Employer contributions | 280 | 276 |
Benefits and administrative expenses paid | (6,558) | (6,384) |
Ending balance, fair value of plan assets | 106,333 | 111,934 | $ 105,443
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Pension Non-Current Assets | 8,578 | 8,745 |
Pension liabilities | 0 | 0 |
Net amount recognized | 8,578 | 8,745 |
Amounts recognized in accumulated other comprehensive loss (before income taxes) consist of: |  |  |
Net actuarial loss | (15,113) | (15,108) |
Total loss recognized | $ (15,113) | $ (15,108) |
Weighted-average assumptions used to determine pension benefit obligations at year end: |  |  |
Discount rate | 5.20% | 4.90% |

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